Fyi, hybrid mutex support in BDB 4.6.21 is still not a good idea on 2.6 Linux
systems.

And just to be clear, because I probably didn't include enough context above -
the "fix" for the poor locking behavior in 4.6.19 was just the addition of a
yield() call in the spinlock loop, and yield() is known to have very poor
behavior on 2.6 Linux NPTL systems.
--
-- Howard Chu
Chief Architect, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/